Parties are directed to file supplemental briefs addressing the following question: Whether appellants have standing under Article III of the United States Constitution. Briefs, not to exceed 15 pages each, are to be filed simultaneously with Clerk and served upon opposing counsel on or before Tuesday, October 13, 2015. Reply briefs, not to exceed 10 pages each, are to the filed with Clerk and served upon opposing counsel on or before Tuesday, October 20, 2015.